Stock Splits

Declared

Ex-Date

Record

Payable

Type

Nov 17, 2011

Nov 17, 2011

Nov 17, 2011

Nov 17, 2011

Reverse split

Jan 15, 2004

Jan 15, 2004

Jan 15, 2004

Jan 15, 2004

Reverse split

The historical dividend information provided is for informational purposes only, and is not intended for trading purposes. The historical dividend information is provided by Mergent, a third party service, and Arrowhead Pharmaceuticals, Inc. does not maintain or provide information directly to this service. Total dividends per year is based on the dividend ex-date.